switch statfs to fget_light/fput_light

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/statfs.c b/fs/statfs.c
index 43e6b6f..95ad5c0 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -87,11 +87,12 @@
 
 int fd_statfs(int fd, struct kstatfs *st)
 {
-	struct file *file = fget(fd);
+	int fput_needed;
+	struct file *file = fget_light(fd, &fput_needed);
 	int error = -EBADF;
 	if (file) {
 		error = vfs_statfs(&file->f_path, st);
-		fput(file);
+		fput_light(file, fput_needed);
 	}
 	return error;
 }